<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="信息描述">
        <el-tag type="info">excel模版说明</el-tag>
        <el-tag>
          <i class="el-icon-download" />
          <a :href="'/static/课程分类列表模板.xls'">点击下载模版</a>
        </el-tag>
      </el-form-item>
      <el-form-item label="选择Excel">
          <!-- 
              ref:组件的唯一标识
              auto-upload:自动上传，现在设置为false，表示不让文件自动上传，需手动确定触发
           -->
        <el-upload
          ref="upload"  
          :auto-upload="false"
          :on-success="fileUploadSuccess"
          :on-error="fileUploadError"
          :disabled="importBtnDisabled"
          :limit="1"
          :action="BASE_API + '/eduservice/subject/addSubject'"
          name="file"
          accept="application/vnd.ms-excel">
          <el-button slot="trigger" size="small" type="primary">选取文件</el-button>
          <el-button
            :loading="loading"
            style="margin-left: 10px"
            size="small"
            type="success"
            @click="submitUpload">{{ fileUploadBtnText }}</el-button>
        </el-upload>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
export default {
  data() {
    return {
      BASE_API: process.env.BASE_API, // 接口API地址
      OSS_PATH: process.env.OSS_PATH, // 阿里云OSS地址
      fileUploadBtnText: "上传到服务器", // 按钮文字
      importBtnDisabled: false, // 按钮是否禁用,
      loading: false,
    }
  },
  created() {},
  methods: {
      // 点击按钮上传文件到接口里面
      submitUpload(){
        this.fileUploadBtnText = '正在上传'
        this.importBtnDisabled = true
        this.loading = true
        // js原生代码这么写：document.getElementById("upload").submit()
        this.$refs.upload.submit()
      },
      // 上传成功
      fileUploadSuccess(response){
        this.loading = false
        this.$message({
            type: 'success',
            message: '添加课程分类成功'
        })
        // 跳转课程分类列表
        // 路由跳转
        this.$router.push({path:'/subject/list'})
      },
      // 上传失败
      fileUploadError(){
        this.loading = false
        this.$message({
            type: 'error',
            message: '添加课程分类失败'
        })
      }
  },
}
</script>